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FANUC Alarm SPOT-364 — WARN IWC has invalid DPRAM signature

FANUC SPOT-364 (“WARN IWC has invalid DPRAM signature”): IWC has invalid DPRAM signature An IWC board was detected, but the contents of the dual-port RAM area is not what is expected. First check: Make sure that the correct type of IWC board is installed.

Updated 2026-09-17 · LogrobotLM reference

Description

IWC has invalid DPRAM signature An IWC board was detected, but the contents of the dual-port RAM area is not what is expected.

Remedy

Make sure that the correct type of IWC board is installed. If the problem persists, swap in a new board.

Related codes

SPOT-362WARN Timeout, IWC msg recvSPOT-363WARN IWC motherboard errorSPOT-365WARN Unsupported IWC version/rev levelSPOT-366WARN Unable to register IWC interrupt

Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. How this reference is built →